Submit a doodle idea to http://www.doodlage.com/ . First, check out the website. Second, think about all the times you find yourself doodling; on the phone, while your parents are talking to you, while your art teacher is talking...you name it, I bet that you have doodled. Well, you just made some really great art. So, let's put it out there, available for the public.
Once done, post on your wiki page for grading.